Speed setting arrangement for sewing machines

Details Speed setting arrangement for sewing machines Speed setting arrangement for sewing machines

D - Textiles, Paper

05

B

342/22

D05B 69/18 (2006.01) D05B 69/00 (2006.01)

Patent

CA 1172734

-19- TITLE OF THE INVENTION SPEED SETTING ARRANGEMENT FOR SEWING MACHINES ABSTRACT OF THE DISCLOSURE A speed setting arrangement for a sewing machine comprises a permanent magnet mounted for unitary rotation with the foot pedal of the sewing machine, and a magnetic sensor including a plurality of magnetoresistors arranged in pairs to form a bridge circuit on a stationary plane spaced a distance from the plane of rotation of the magnet. The magnetic sensor provides an output signal which is exclusively a function of the magnetic orientation of the magnet and thus serves as a valid indication of the amount of pedal depression. An analog to digital converter is coupled to the magnetic sensor to convert its output into a digital signal for speed control purposes. -19-

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